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Primary Collection of Cheats

Cheat mode (Custom Edition)
Start the game with the "-console -devmode" command line parameter. Press [~] during game play to display the console window, then enter one of the following codes to activate the corresponding cheat function. Note: You cannot enable codes in online games. Also, commonly used commands can be placed in an "init.txt" text file in the main game directory that also contains the "halo.exe". Entries in that file should be made in the same format that they are entered into the console, and will be activated automatically when the game is started.

Toggle instant deaths for enemies that see player

cheat_medusa <0 or 1>

Set game speed

game_speed <0-20>

Clear console window

cls

Toggle unlimited ammunition and no overheating for human weapons and plasma weapons

cheat_bottomless_clip <0 or 1>

Unlimited ammunition

cheat_infinite_ammo <0 or 1>

Super jumps

cheat_super_jump <0 or 1>

Possess touched character

cheat_bump_possession <0 or 1>

Invincibility

cheat_deathless_player <0 or 1>

Spawn Warthog

cheat_spawn_warthog

Spawn all power-ups

cheat_all_powerups

Spawn all vehicles

cheat_all_vehicles

Spawn all weapons

cheat_all_weapons

Teleport player to current camera position

cheat_teleport_to_camera

Save current camera location

debug_camera_save

Go to saved camera location, away from player

debug_camera_load

Quit game

quit

Debug camera commands
Use one of the following commands to move the camera, after the "debug_camera_load" has been used.

W: Forward
S: Back
A: Strafe left
D: Strafe right
R: Up
F: down
Mouse: Turn
Mouse Wheel Up or Down: Movement speed

Screenshots
Start the game with the "-screenshot" command line parameter. Press [Prt Scn] during game play to copy the current screen to the clipboard. You may now paste it into the program of your choice.

Alternate ending sequence
Successfully complete the last level of the game in campaign mode under the legendary difficulty setting. The new ending features a human and alien fighting hand to hand. The human will say "Its over", and then they hug because they know the explosion will kill them both. Also, the FMV sequence of each battle scene will be slightly longer.

Alternate dialogue
Playing under the legendary difficulty setting introduces new dialogue not heard in other modes. For example, after being massacred by a force of Grunts, Jackals and Elites, one of the grunts asks, "Can I have his helmet?". Also, your fellow Marines seem to be a bit more chatty (as well as profane).

Under the legendary difficulty setting, view the entire first FMV sequence. During the sequence, the General says things very differently when compared to the sequence under the easy difficulty setting.

Hints

Multi-player mode suicide
There are several ways to commit suicide on multi-player mode. Go to a level that has ceilings, preferably Rat Race. Get a plasma grenade, aim straight up, and throw it. Do not move. It will fall and stick to you, eventually blowing up and killing you. Another way is to have two plasma grenades. Throw the first one about ten feet from you then immediately throw another one about a foot in front of the other. Line yourself up with them. The second plasma grenade will be blown into you. Another way is to make a game play option where there are no shields and all shotguns. Go to a level with stationary Covenant shields. Get as close to one as you can with a shotgun. Shoot the shield and you will die.

Multi-player mode catapult
Go to a level that supports vehicles. The following weapons are requred: a plasma grenade, fragmentation grenade, and a rocket in a rocket launcher. When first trying this, back a Warthog up to a wall. Get on top of the Warthog's gun (not manning it). Look at the ground in front of the Warthog. Throw the plasma grenade in front of the Warthog. Immediately throw the fragmentation grenade directly on the plasma grenade. Then, immediately shoot the two grenades with the rocket launcher. You may be hurt in the process. However, you will be propelled high into the air if done correctly. Note: You can use this trick to get on top of the cliffs in Blood Gulch.

Glitch: Shoot enemy through wall
In multi-player mode, drive any Warthog close to a building so that the side of it is touching. Get in the gunners turret and turn it towards the wall. If done correctly and you are close enough, you should be able to to shoot at an enemy through the wall and not receive damage from them if they shoot back.